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IIR document

Novel energy system for near zero energy houses.

Number: pap. 182

Author(s) : STAVSET O., JUSTO ALONSO M., CLAUSSEN I. C.

Summary

The space heating demand in near zero energy houses is reduced due to increased insulation thickness. As a result, the demand for heating of domestic hot water (DHW) has become a more significant part of the total energy demand in these buildings. Ordinary heat pumps perform inefficiently when covering heating, cooling and ventilation due to the high temperature requirements for DHW, thus a high temperature difference in the condenser. In this article an innovative design heat pump for near zero energy houses is discussed. The objective of this work is to carry out simulations and presentation of a CO2 heat pump which uses the exhaust air from the ventilation system as heat source to provide space heating (SH), heating of ventilation air and DHW. As the CO2 heat pump is used for these three demands the coefficient of performance factor (COP) of the whole unit increases as the return CO2 temperature decreases. Results show that the simulation of the CO2 heat pump gave a COP of 4.4 when operating in winter modus. In addition, CO2 is a natural working fluid with no ozone depletion potential (ODP) and a global warming potential (GWP) of only 1.

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Pages: 8 p.

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Details

  • Original title: Novel energy system for near zero energy houses.
  • Record ID : 30012065
  • Languages: English
  • Source: 3rd IIR International Conference on Sustainability and the Cold Chain. Proceedings: London, UK, June 23-25, 2014
  • Publication date: 2014/06/23

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